Dweets by u/pavel

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Opposites

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pavel

remix of d/701 by u/sigveseb

function u(t) {

for(x[f='fillRect'](i=8,0,2e3,2e3);w=3*i--;)for(x.fillStyle=R(s=666/i,s/2,s/4),k=w*w;b=k--/w|0;a+b&1&&x[f]((a-t%2)*s,(b-2+S(t))*s,s,s))a=k%w

Mar 4 2019 8:47 PM UTC

}// 140/140

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More layers and a black background #improved

u/sigveseb

Nice!

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pavel

function u(t) {

for(c.width=120,k=4072;j=--k>>6;x.fillRect(60+i,j,1,1))i=k%64-32,s=64*j-i*i-j*j,f=s**.5*S(a=S(3*t))+i*C(a),x.fillStyle=R(g=f*f/4,g,g+f,s/99)

Mar 3 2019 3:17 AM UTC

}// 140/140

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u/aleamb

#shading
u/13thptr

#sphere

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pavel

function u(t) {

for(k=2e3;i=S(t+k),j=S(i*k--);f&&x.fillRect(960+540*i,540*++j,9,4))d=1-i*i-j*j,f=d**.5*2-i-j,x.fillStyle=R(g=8*f**3,g,g+28*f,1-.05/d)

Feb 28 2019 7:26 PM UTC

}// 133/140

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pavel

function u(t) {

for(c.width|=p=300;e=p--**.9%1;x.fillRect(960+r(0)/z,200+99/z,s=9*e/z,s))r=d=>p/(1+e*C(a=t/4+p))*C(a+p+d)+2*p/(1/e-e)*C(p+d),z=.5+r(1.6)/800

Feb 28 2019 6:54 AM UTC

}// 140/140

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Galaxy

u/pavel

300 bodies which individually only interact with an infinite mass at the center
u/pavel

Each body moves around an ellipse, the orbits are accurate. However, the movement speed is a very rough approximation.
u/pavel

Naively drawing an ellipse centers it around one of the focal points, however moving a body on this path slows the body down near this focal point and speeds it up near the other one.
u/pavel

The opposite effect is needed. So this code still moves a body around an ellipse but it re-centers the ellipse on the 'other' focal point.
u/pavel

In polar coordinates the difference between the x and y coordinates is a phase shift of pi/2 ~ 1.6

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pavel

function u(t) {

for(c.width|=i=99;S[u[t]=t]=x[t]=i--;x.fillRect(960+(u[i]+=S[i]-=u[i]/d),540+(x[i]+=C[i]-=x[i]/d),C[t++]=9,9))d=(u[i]**2+x[i]**2)**1.5/7e3

Feb 28 2019 5:17 AM UTC

}// 138/140

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#physics #orbit #orbits

u/pavel

Funky start due to lack of chars but quickly settles. Imagine a black hole in the middle.

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pavel

remix of d/12516 by u/pavel

function u(t) {

for(;t<9;)u[c[t]=t]=50*t++
for(c.width|=a=9;b=a--;u[b]-p<50&&(c[a]=c[b],c[b]=v))x.fillRect(960+(p=u[a]+=v=c[a]*=u[a]**2<8e5||-1),440,50,200)

Feb 26 2019 12:36 AM UTC

}// 140/140

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#default #physics #uncompressed

u/13thptr

cool
u/lionleaf

Amazing!
u/Ath0r

Very nice!
u/katkip

!!

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pavel

function u(t) {

eval(unescape(escape`𭀿𨰮𭱩𩁴𪁼🐰𞠨𭠽𦰮𛠮𩀽𙰰𜐲𜰴𝐶𝰸𞐧𧐬𬀽𦰮𛠮𩁝𚐻𩡯𬠨𨐠𪑮𘁰𚑻𩡯𬠨𨠽𨐻𨠭𛐻𚑰𦱢𧐾𬁛𨑝𛑁𙠦𚁰𦱢𧐽𬁛𨑝𛑁𛁛𭡛𨑝𛁶𦱢𧑝👛𭡛𨡝𛁶𦱡𧑝𚐻𮀮𩡩𫁬𤡥𨱴𚀹𝠰𚰨𬁛𨑝𚰽𭡛𨑝𚠽𬁛𨑝𚠪𜠼𝱥𝑼𯀭𜐩𛀵𜀰𛁁🐵𜀬𜠰𜀩𯐻`.replace(/u../g,'')))

Feb 24 2019 7:59 PM UTC

}// 134/140

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#default #physics #compressed

u/katkip

WOW
u/tehpsalmist

Underrated dweet right here.
u/Galaxtone

225/140
u/Galaxtone

Someone must of abused the ApI
u/f8f82804

u/Galaxtone: yes, this compression approach exploits a bug in dweet submission

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pavel

remix of d/12331 by u/pavel

function u(t) {

for(j=t?2e3:a=b=0;j--;x.fillRect(960+450*a,540+450*b,1,1))s=(j**t&2)-1,A=(Math.hypot(a+=.123,b+=.745)+a)/2,b=(b<0?-s:s)*(A-a)**.5,a=s*A**.5

Feb 15 2019 12:02 AM UTC

}// 139/140

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Douady's rabbit #fractal #attractor

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pavel

remix of d/12355 by u/cantelope

function u(t) {

for(i=c.width|=h=355/226,w=960;Y=w-i--**h%w*2;x.fillRect(w+S(i+t)*w*r/z,540+Y/z,s=99/z/z,s))r=(Y*Y<8e5||Y%1)/S(i%h+h/2),z=4-S(t)-r*C(i+t)

Feb 14 2019 11:21 PM UTC

}// 137/140

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#uncompressed

Show more comments…
u/pavel

The base code draws a tube. 1/S(i%h+h/2) radius makes the tube have a square cross section.
u/pavel

(Y*Y<8e5||Y%1) randomizes the radius between 0 and 1 near top and bottom.
u/pavel

Err, between -1 and 1, and this makes the top and bottom panels.
u/cantelope

I see some gathering of points in the middle of the top and bottom panels, but other than that, a faithful reproduction. kudos!
u/pavel

I use polar coordinates, even though the radius is uniformly random that results in more dots near the middle :/
u/iverjo

#cube #d3

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pavel

function u(t) {

f=(X,Y,r,a,s,d=1)=>r>.2&&x.lineTo(X,Y)|f(X+C(a-=s/55)*r,Y+S(a)*r,r-r/15,a,s,-d)|f(X,Y,r/3,a+s*d,s*d)
t||f(-60,600,140,0,1)|x.stroke()

Feb 14 2019 10:05 PM UTC

}// 133/140

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Barnsley-like #fern #fractal

u/rep_movsd

#underrated

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